Re: [RFT] x86 acpi: normalize segment descriptor register on resume

[H. Peter Anvin]

Andi Kleen wrote:
> Hmm, but the change was not supposed to break the s3 bios. Something
> fishy is going on. It sounds like the s3 bios relies on some earlier
> segment register setup.
>
> If true this means the segment register reset would need to be moved
> later after S3 bios ran. Saving/restoring is unfortunately not possible
> because we cannot save/restore the hidden state loaded from the GDT earlier.

That really doesn't make sense, though.  The VESA BIOS has to be entered 
in clean real mode; it's designed to be entered from reset, after all. 
There is definitely something fishy going on, but I don't think this 
particular aspect is it.

What's *really* odd is that this was required with the old code but 
doesn't work at all with the new code.  The former is understandable, 
the latter is not.

	-hpa
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